Daryl Watters asked:
Stachybotrys not always, but almost always exhibits a circular growth pattern forming round colonies of about 1 inch or less to about 1 foot across approximately. Sometimes the circles are complete.
Other times, the circles are incomplete and form semi circles or crescent moon shapes when one side of the colony grows but the other side does not grow well, possibly due to a lack of moisture or competition with other mold types on the weaker growing side of the colony. Also, the mold often forms concentric circles of one circle inside another circle. When this or most molds grows in areas where building materials have been very wet for an extended period of time, such as months as opposed to days or just a few weeks, then the colonies grow into each other this is referred to as confluent growth and the circles are not longer distinguishable and all you see is irregular black patches of mold growth on the wall.
Stachybotrys is an extremely dark black mold. It is often reported to be shiny or slimy in appearance, however, from personal experience, this is only true when the mold is wet. When it is dry, it can be very dark black and powdery. Please note that all the above descriptions will sound wrong to a mold lab tech because the above are descriptions of how the mold looks when it grows on walls. In a Petri dish the same mold probably does not grow in concentric circles and it looks more fuzzy and may start out whitish, and it turns black later as it produces spores. In Identifying Filamentous Fungi by Guy St-Germain and Richard Summerbell the mold growing in a petri dish can be white, pink, orange, or black on the surface; bottom of the colony can be pale, orange, pink or black.
Stachybotrys requires high-cellulose, low-nitrogen food source, such as drywall or cardboard and very soaking wet conditions for an extended period of time. It is a slow grower. I have seen thousands of Stachybotrys colonies and have never seen it growing on metal objects, air conditioning ducts, or clothes. Its most common habitats in homes appears to be on the underside of wet carpets, or the bottom of wet cardboard boxes or other papers, or on the surface of drywall materials. When it grows on drywall, it is actually growing on the thin paper that coats both surfaces of the drywall.
Amanda Fain asked:
If you have wet walls, you’ll surely get mold. Wallboard, drywall, plywood, paper and cardboard give mold a perfect place to grow. The material made in the construction of your walls is porous, so it offers the mold a great place to live.
Stachybotrys chartarum, an infamous type of toxic black mold that has a slightly greenish-black color, is often found in wet walls. Unlike your shower mold, which is non-toxic, this mold grows often in building materials.
If you have wet walls in your house, you should remove the material immediately and make sure the black mold doesn’t come back.
Getting Rid Of The Moldy Walls
One huge mistake people often make is trying to paint over the water damaged spots on their walls. This won’t do anything! In face, mold can grow really well on paint.
What you have to do is take off the wet portions of the wall. Remove all the wet wall as quickly as possible, before mold has a chance to grow. Before you take it off, spray it with water from a spray bottle. All the porous wall material should be wet when you remove it, so that you won’t be spreading mold spores everywhere.
Wear protective clothes, make sure the area has plenty of circulation and dispose of the moldy wall material safely. Put all the moldy stuff in plastic bags for safe removal. It’s important to not let the mold spores contaminate the rest of the house.
Look closely at the dry parts to see if there’s mold hiding out behind it. You can just take off a small piece of the wall near the moldy area and check. In areas where the walls are wet, there is a good chance that the adjacent dry walls will also have mold growing.
After the wet walls have been removed, spray the walls with a bleach solution. Be careful with the bleach. Mixing it with any other cleaning products can cause toxic fumes. You should only use water in your bleach solution. Make it weak; no more than 1 part bleach to 1 part water. Bleach can irritate your nose, eyes and ears. For more info see http://www.toxicblackmoldhelp.org/removing/removing_Black_Mold_On_Shirts.html
Use a scrub brush for the wall and make sure you get rid of all the mold. If some of the muck runs down to the floor, clean it up with a vacuum.
If possible, dispose of everything that has been in contact with mold. This includes drop clothes, but also the clothes that you were wearing. If you don’t want to get rid of your clothes, wash them well in hot water and bleach.
Keeping The Mold Out Of Your Walls
Before you install any new stuff, make sure the wall has dried out completely. You can run a dehumidifier in your basement or wherever the wet walls were to speed up the process. Just make sure it’s totally dry before you begin construction again.
When building again, there are a few materials that will help keep mold away, depending on what you plan on putting there. A concrete backer board might be helpful to keep the wall dry. If you want to use tile, put up a 1/2 inch concrete backer board. If you want to put a surround, get a green board rock. You can find concrete backer board and green board rocks at your local home supply or hardware store.
The most important thing you can do to keep mold from growing again is to keep the room dry and well-ventilated. Remember that mold likes wet, dark places and grows well on porous material. After you’ve cleaned up and put in new walls, check from time to time to make sure the mold hasn’t come back.
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